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Employee Equity-Based Compensation - Stock Option Supplemental Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Options Outstanding    
Number of options (shares) 8,093,343  
Weighted average remaining contractual term (in years) 6 years 2 months 5 days  
Weighted average exercise price (dollars per share) $ 12.11 $ 10.16
Weighted average fair value (dollars per share) $ 8.52  
Aggregate intrinsic value (in thousands) $ 88,348  
Options Exercisable    
Number of options (shares) 5,689,985  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 5 years 1 month 17 days  
Weighted average exercise price (dollars per share) $ 8.00  
Weighted average fair value (dollars per share) $ 5.68  
Aggregate intrinsic value (in thousands) $ 83,067